Journal of Economic Entomology (2009) 102, 440-445

From Pestinfo-Wiki
Jump to: navigation, search

Kevin A. Shufran and Tracey L. Payton (2009)
Limited genetic variation within and between Russian wheat aphid (Hemiptera: Aphididae) biotypes in the United States
Journal of Economic Entomology 102 (1), 440-445
Abstract: Insect biotypes are populations able to kill or injure crops with resistance genes and complicate pest management programs based on host plant resistance. Biotypes occur in Russian wheat aphid, Diuraphis noxia (Kurdjumov) (Hemiptera: Aphididae), a worldwide pest of wheat, Triticum aestivum L., and barley, Hordeum vulgare L., that was introduced into Mexico in 1980 and then spread into Texas by 1986. Five D. noxia biotypes were described in the United States and given the number designations 1 through 5. Of these, only Biotypes 1 and 2, which are nondamaging and damaging to Dn4-resistant wheat, respectively, are common and agriculturally important. Only a single clone of Biotypes 3, 4, and 5 were found in nature and now exist in the laboratory. The biotypes were found after 5 yr of the commercial planting of resistant wheat and their origin is unknown. To understand the genetic relatedness and origin of D. noxia biotypes in the United States, we used three molecular markers to assay for genetic variation within and between Biotypes 1 and 2, and for variation between Biotypes 1, 2, 3, 4, and 5. A single random amplified polymorphic DNA polymorphism was found in only two individuals. No DNA sequence variation in the cytochrome oxidase subunit I mitochondrial gene was found between 26 D. noxia clones. No variation was found at seven examined simple sequence repeat loci. Results suggest Biotype 2 originated from the extant population and does not represent a second introduction of a genetically divergent biotype.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
molecular biology - genes
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Diuraphis noxia Barley (Hordeum vulgare) U.S.A. (SW)
Diuraphis noxia Barley (Hordeum vulgare) U.S.A. (NW)
Diuraphis noxia Barley (Hordeum vulgare) U.S.A. (mid S)
Diuraphis noxia Rye (Secale cereale) U.S.A. (mid S)
Diuraphis noxia Wheat (Triticum) U.S.A. (SW)
Diuraphis noxia Wheat (Triticum) U.S.A. (NW)
Diuraphis noxia Wheat (Triticum) U.S.A. (mid N)
Diuraphis noxia Wheat (Triticum) U.S.A. (mid S)